Configurable tasks and specs paths

[rafalsobota]

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[rafalsobota]

I signed it!

[googlebot]

CLAs look good, thanks!

[cbraynor]

check out lodash's _.has() method here to simplify the logic

[cbraynor]

Thanks for the PR. I like the idea of being able to specify these values and how this is backwards compatible, but the JSDoc comments, README documentation, and tests all need updating before I can consider merging this PR.

Also check out my couple of nit-pick comments.

[rafalsobota]

Thanks for the response. Something else should be improved?